A: No they do not. 

A: No they must be assembled using the factory top hat and rubber insulator. It’s best to purchase NEW top hats and associated hardware and not reuse the original parts. This will also make installation and swap easy.

A: No, you will assembled and set the ride height with adjustable spring seats.

A: Yes worth the $$$ I installed it on my 2020 RST 1500 and what  a difference it made in the ride quality my only regret is I wish I had pull the trigger on rather then I had bought the 2” block to level my truck but hated the ride. I bought this to improve the ride quality plus to level my truck I also replace the rear shocks with the bilstein 5160 and man the smoothest ride for a pickup truck 

A: Yes. I have them on my 1500 3.0.

A: I'd give Bilstein a call. They provided me excellent advice. Each truck is different. My 2020 Sierra 1500 front suspension bottomed out on a particular railroad crossing, whereas I hardly notice it with the new Bilstein setup.

A: The 6112 is a great ride on the street not harsh at all. You won’t be disappointed.